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【题目】It's impolite to keep someone________ for a long time.

A.waitB.to waitC.waitingD.have waited

【答案】C

【解析】

句意:让人久等是不礼貌的。

考查固定用法,A. wait 动词原形;B. to wait动词不定式;C. waiting动词现在分词;D. have waited现在完成时。根据“keep sb doing sth让某人一直做某事”,故选C

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